Book Image

SwiftUI Cookbook - Second Edition

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook - Second Edition

By: Giordano Scalzo, Edgar Nzokwe

Overview of this book

SwiftUI provides an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based cookbook, you’ll cover the foundations of SwiftUI as well as the new SwiftUI 3 features introduced in iOS 15 and explore a range of essential techniques and concepts that will help you through the development process. The cookbook begins by explaining how to use basic SwiftUI components. Once you’ve learned the core concepts of UI development, such as Views, Controls, Lists, and ScrollViews, using practical implementations in Swift, you'll advance to adding useful features to SwiftUI using drawings, built-in shapes, animations, and transitions. You’ll understand how to integrate SwiftUI with exciting new components in the Apple development ecosystem, such as Combine for managing events and Core Data for managing app data. Finally, you’ll write iOS, macOS, and watchOS apps by sharing the same SwiftUI codebase. By the end of this SwiftUI book, you'll have discovered a range of simple, direct solutions to common problems encountered when building SwiftUI apps.
Table of Contents (17 chapters)

Implementing SwiftUI views using Playground

One of the most surprising and useful innovations brought by Swift is the Playground, a simple file that contains Swift code and that can be seen and modified in real time without waiting for the full cycle of a rebuild.

Again, Playground supports UIKit, but since SwiftUI can be quickly embedded in a UIKit component, we can use Playground for rapidly prototyping SwiftUI views too.

Getting ready

Create a Playground file (File | New | Playground) in Xcode called SwiftUIPlayground.

How to do it…

The power of Playground is that you can make a change and immediately see the result. Importing the PlaygroundSupport framework, you can also render a UIViewController class to be shown during the Playground session.

We are going to define a simple SwiftUI view to be rendered in Playground. Follow these steps:

  1. Start by importing the needed frameworks:
    import PlaygroundSupport
    import SwiftUI
  2. Create an extension to the...